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基于動(dòng)態(tài)識(shí)別區(qū)和B樣條曲線的智能叉車避障路徑規(guī)劃
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國家重點(diǎn)研發(fā)計(jì)劃項(xiàng)目(2018YFD0701002)、國家自然科學(xué)基金項(xiàng)目(51108194)、廣東省基礎(chǔ)研究及應(yīng)用研究重大項(xiàng)目(2016KZDXM028)和廣東省科技計(jì)劃項(xiàng)目(2017B020206005)


Obstacle Avoidance Path Planning for Intelligent Forklift Truck Based on Dynamic Identification Zone and B-spline Curve
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    摘要:

    為降低干果倉儲(chǔ)智能叉車自主避障誤警率,提高倉儲(chǔ)空間有效利用率,結(jié)合叉車運(yùn)行環(huán)境特點(diǎn),基于激光傳感器,設(shè)立探測范圍隨車速、等效轉(zhuǎn)向角變化的動(dòng)態(tài)識(shí)別區(qū),有效探測叉車行進(jìn)方向上的障礙物;將獲得的障礙物特征控制點(diǎn)作為分割點(diǎn),采用四次五階準(zhǔn)均勻B樣條曲線,分前后段合并生成滿足叉車最小轉(zhuǎn)彎半徑、曲率連續(xù)、最大轉(zhuǎn)向輪角速度等多約束條件下的避障路徑;對倉庫中的直行路段和轉(zhuǎn)彎路段進(jìn)行避障路徑規(guī)劃試驗(yàn),結(jié)果表明所得避障路徑滿足各項(xiàng)約束,曲率不大于1.06×10-3mm-1,等效轉(zhuǎn)向角不大于60°,等效轉(zhuǎn)向輪角速度不大于1.05rad/s,驗(yàn)證了算法的可行性。

    Abstract:

    In order to reduce the false alarm rate of autonomous obstacle avoidance for intelligent forklift trucks in dried fruit warehouse and improve the utilization rate of warehouse space, combining with the characteristics of the operating environment of forklift truck, and basing on the laser sensor SICK-LMS111 and SICK-NAV350, a dynamic identification zone that the detection range was changed along with the speed and equivalent steering angle was set up to effectively detect obstacles in the direction of travel. Then, feature control point obtained by obstacles was taken as the segmentation point, and the quartic fiveorder quasiuniform Bspline curves were used to generate the obstacle avoidance path by combining front and rear segments of curve, which met the multiconstraint conditions such as the minimum turning radius, the continuous curvature and the maximum angular velocity of steering wheel. By carrying out the obstacle avoidance path planning tests on the straight road section and the turning in the warehouse, the results showed that the obstacle avoidance paths satisfied various constraints, the curvature was not more than 1.06×10-3mm-1, equivalent steering angle was not more than 60°, angular velocity of equivalent steering wheel was not greater than 1.05rad/s, which effectively verified the feasibility of the algorithm. It can be used as a reference for obstacle avoidance technology of similar large warehouse intelligent vehicles.

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呂恩利,阮清松,劉妍華,王飛仁,林偉加,董冰.基于動(dòng)態(tài)識(shí)別區(qū)和B樣條曲線的智能叉車避障路徑規(guī)劃[J].農(nóng)業(yè)機(jī)械學(xué)報(bào),2019,50(1):359-366. LU Enli, RUAN Qingsong, LIU Yanhua, WANG Feiren, LIN Weijia, DONG Bing. Obstacle Avoidance Path Planning for Intelligent Forklift Truck Based on Dynamic Identification Zone and B-spline Curve[J]. Transactions of the Chinese Society for Agricultural Machinery,2019,50(1):359-366.

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  • 收稿日期:2018-10-15
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  • 在線發(fā)布日期: 2019-01-10
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